As of right now there are YTD and MTD functions, as well as a DAX function which computes a running total for all time, but we are looking for a means of calculating a running total for a declared da...
I've created a proposal to add ordered iterators to DAX, which should make it much easier to create/use running totals. I think it could work well for your use case. https://ideas.powerbi.com/forums/265200-power-bi-ideas/suggestions/40647124-ordered-iterators
